ESP电场中高质量浓度区粉尘气流的强制收集技术

针对目前电除尘器实际收尘效率偏低的问题,探讨了提高电除尘器收尘效率的相关措施.通过电场粉尘传输模型的数学解析和断面质量浓度实测,表明电场中粉尘分布存在质量浓度梯度,愈靠近极板质量浓度愈高.在电除尘器收尘极板末端用吸风口强制收集高质量浓度粉尘气流,对强制收集的高质量浓度粉尘气流采用高效布袋处理或循环至入口进行二级处理,可以显著降低电除尘器出口粉尘排放量.同时强制吸风可以显著改善由于振打清灰造成的粉尘二次飞扬.对等速吸风口流函数的分析,揭示出吸风高度与收尘效率之间的数学关系.

Forced Collection Applied to Gas Flow Containing High-Mass-Concentration Dust in ESP Electric Field

Discusses theoretically and experimentally how to improve the efficiency of dust collection by use of ESP of which the efficiency is actually low until now.It was proved that there is a mass concentration gradient in dust distribution within the electric field by way of a mathematic analysis of the dust transfer model and the sectional measurement of dust mass concentration,i.e.,the closer the dust to the plate electrode,the higher the mass concentration.The dust emission rate can be significantly decreased at ESP outlet when the gas flow containing high-concentration dust is sucked out through a suction opening at the end of ESP's plate electrode and the dust thus collected is then gathered into high-efficiency bags or treated secondarily at ESP inlet as the gas flow is cycled there.In addition,such a forced suction can reduce effectively the secondary dust flying due to beating/shaking the dust collecting plate.Analyzing the flow function at suction opening where the flowrate is constant,the relationship between suction height and efficiency of dust collection is revealed.